Radiocondenser



- the capacity aused the opposed Q Another object is to simplify and at the same time to enable the Patented Apr. 3, 1528.

WILLIAM L. HUDSON, 0F SYRACUSE, NEW YORK.

RADIO CONDEN Application filed August 18, 1925. serial No. 50,921.

This invention relates to a radio condenser involving the use of opposed sets of plates which arerelatirely adjustable for varying tuning of the receiving instrument with sending instruments of local or distant statrons.

In radio condensers of sets'of condenser plates are relati ely adjustable by means of, a suitahle indexing device graduated to correspond to "sa us Wave velocities of different broadcast stations but in many instances Where there are only slight variations in wave velocities from the different sending stations where the receiving Waves are relatively Weak it is extremely diiilcult, if not impractical, to selectively tune the receiving instru- With the sending stations and in order tocvercoine this difliculty it is customary to provide What is commonly known as a Vernier condenser or adjustment which permits a sharper or closer tuning of the receiving instrument- With the station desired.

The main object of this invention is to provide in one and the same condenser means for selectively tuning the receiving instrument with not only the Widely vaiyingz Wave velocities hut also with the slightly varying Wave velocities or intensities of local or distant broadcasting stations.

ln other Words l have soughttoprovide a simple form of variable condenser in which the opposed plates have at least two relative adjustments, one for approximate selective tuning and the other for. a closer selective regulation of the approximate tuning where by the receiving instrument may be easily, quickly and accurately tuned to any one of a number of slightly varying Wave velocities of as many stations Without interference from any other station.

Another object is to reduce to a minimum the liahilitv oi hack lash or lost motion in the primary adjusting means and thereby to incirease the efiicicncv of the capacity regulation of the condenser.

struction of the plate supporting elements each set to he more firmly and positively held in the desired spaced relation and there, by to establish a more uniform ari'd'symmetrical air dielectric between the plates.

A still further object is to reduce to a minimum the liability of inductance or curas may be required for selective this type commonly the conplates of rent leakage to and from the plates and external conductors.

One of the specific objects is to simple and elficient means for ad; i set of condenser plates relativelv to t set after the other set has heeii ahring the condenser into approxnne with the desired sending station,

Other GlJjECiIS and uses relating to r 1 parts of the invention will he hrouoht on the following description: a

' In the dra -VingsL Figure l. is a perspective iv proved condenser and the o for both sets oi pistes.

Figure 2 is an enlarged View taken on line :2-2., 1 portion of the apparatus including denser plates being omitted" Ir Figure 3 is an enlarged transverse sectional view talren on line As illustrated, this device cos c porting standard having tially flat base -2- adapted to 3 i to any available support not nec herein illustrate or describe except that device is to be properly associated with parts of a radio receiving set.

The standard --l is provided in l.-shape l top in which is a bar .4 0i. insulating m hakelitc which rests upon th, lows; of the part 3- and issecured to the o thereof by suitable screw -Zi-i The upper L shaped portion S-- o standard -1 is provided with a lyprojcctiughuh-6in Whichis l a rotary shaft tended through and beyond the ing a pinion -S- tight thereon, ion having its huh ahutting'agaii face of the liar -tito hold against forward, xial movemen i .A collar -9- is secured to the ate portion. of the shaft -l to abut the hub --6- and thereby to hold the and pinion against axial movement ii'ardly, the front end of the shaft provided With the usual. hand-operated -10 secured thereto and movable a a suitablestationary plate -l1-- which are shown by dotted lines in The opposite oi the her upwardly some distance shore i. i -8 to form a frontrest for a l -7-, the latter hein an opening; in the hm rear face thereof for reccii '-l2--- in its longitudinal movable slldllig so -l2;- ilireeily llle pinion -8-- ssicl bee--l.?2i-bei* flisll hell inpleoe i smeeiol lls plscemem-by so iiprigbl; gizigle loop 125: which is secured is one one lass el-- sonie distsnee to one s? ole oi the piiiioi-i e for guiding the ediseenl; sod of false movemeolsaloop is is secures: to the other enol of the ---l-- scljsceiil: the lower erlge lbs lOt-i-i --1/}-- low eelcli tionslly supporting she letter in ils longituclinsl move i ent. The lower end oi the bar -l2- is irovifleol toolliecl rack A. horizontal guicls --"i2- meshing; with Elie oppeirmosi; teeth oi the pli'llflll 8-- tlfi'ou s which oiprocsto'ry motion, islseiismi'timi from she pinion tothe bar as the pinion is s-olssieol in reverse directions by of the iiial -1G-.

The upper ends of the upsissiicliiig poi?- tions as -4-- and --4J--- of the be:- are provided. with rests sully pi'ojeciiiig? blocks secured thereto directly ovei' soil in spaced relation to the upper eilge of the sliding be -12- for receiving 21ml sup-- porting one end of a pair of llslispeei sorting --16- having their other en-cls spring pi'essecl against the adjacent, upper edge 01" the slide bar -12 i101" pressing eaicl be? clowii'wsrclly and yielclingly holding the sooth of" the reel: -12-- in engagement with the teeth of the pinion -8-- thereby reducing; lo a minimum any beck. lash 01" loss motion oftlie slide be? ---l2- which is lore? eisbly made of insulating materiel such as bslzelite.

oprigli o peel; --l?- is iigiclly secured at its lower end no the T631 face of the slicle bait l2- to extend upwardly some dis-- fiance therefrom and carries at its upper end is cross bar -l8 of insulating material as balzelite upon this cross bar is securely fastened the outer arms oil a flf SlliLPQd metallic plate -19 having laterally erofleeting; loops -2C*-- is vertically spaced re islzios,

These loops are provided with s series of vertically alined relatively narrow slots -2lfor'recei'ving s corresponding Fours ber of condenser pistes -22'- eonstitusmg;

one set on the condenser.

Suitable metallic pins --23-- are 'QQSSQll through the slots 2lin. the loops SEQ- and through the registering openings in the @lales --22-- for rigidly holding" said plates in the slots sgainstloteral displacement will: uler edges of the plates resting fil'llllff b the iniern'xeiliete portions of m loomiplslo --ll--. 1 She slots --.-Qlin the loops of lllfi plate ---'l9 are accurately spaced not form distances apart smlsie oi subsiisnlglsi- 53 the same width as ii'm tliiclmess oi the pistes 2 so co firmly bold said plates it is provided end porlion of the plate -l9- servlog" to firmly hold she condenser pisses -22-- ageless movement relatively iojlie cross bar l8 which, in tum, 1s ilgidly seemed; so the post 17 soil thereby holds the -22 iii fizel relation to "the slide bee --153- to move therewith.

additional upright post --fl7--- is pivo iiileimetliele ils ends at -?;4lto lie block -l5-- oil the upper encl of the pose l to swing lengiliwise oi so in a please :allel with; 'sliesliele bar -2l2 The lower end of the post -1T- is preleisbly angular oi" square iii cross section eiiol extemls lhroogle an elongated slot il l! in horizontal uide-loop uethe slot l.4; being o slightly greater Width lengthwise oi i lie bar 12- than the adjacent portion of she peel, -1T-- to permit e limitecl rocking movement of said post about the axis of its pivot 24.-- for a 'wesencly described.

m 1' eml of the post -17 is rigidly secured by means of a clamp to an insulating block -l.8- similar to the block -i8--. lligidly seemed to the block -l8- is a W-slmpecl metallic plate --19- which is similsi." to the plate -l9- in that with loops 20- having slots -2l for receiving a series or set of condenser plates '22 which are rigidly held in operative position and spaced relation in their respective slots by pin -23? similar to the pins --23-.

It will be observed however that the plate -l9- contains one ll'lOlC of die slots --2l"- than the plate 19 and than; they are arranged in alignment with spaces between the plates 22- so that when the aisl s are brought into overlapping relstion they will be in parallel spaced relation with air dieleeorics belwwn them.

The plates of both sets arse of substantially the same form and. size and when adjusted for use are clispos-eei. in subslsnsielly the some llorizonml blame parallel with and above the sliele be?) -2- 1 The lower sn upper eiiges of the plates are substantially streigli'b and while llieir scljsoent edges are slightly bevelecl. fromhols lfiilglifltll'ilfll centers toward their lower snail upper: edges so lbw; llie in- RG1 edge. of each plate lies Wlm o might be termed a flat'tsper to permit the capacity of the condenser to be adjusted to zooloser degree than would be possible if the inner of she plates, WQK'O straight and parallel.

Soimble moses is provided for rocking Elie post -17 about llllG axis of the pivot -'-Zifor effecting a cori'esponding'movcin parallel parallel lee mom of the plates -'-22- relatively to the.

messes for rocking said post against the action of a retracting spring -29 ivh'ch is ,crposed between the lower end of a stud projecting y from the her -1- as shown ii we 1 r. The front end of the shuttle provided With a pointer -3l and a handle -32 by which letter the shaft may be turned to move t painter around a dial plate 38--, e same time to rotate the eccentric -28- against the post -ll--.

It is now evident thgit the coiled spring 2- serves to yieldingly hold the lower end of the post -l7 against the periphcry of re eccentric -E28- and that if, by rotating the shnft 26- to bring the lower point of the eccentric against the post the letter will he actuated by the spring 2Q to move upper end of: the post and parts carried th Why toward thepletes 22-end that i the shaft rotated to bring the h gh poin the cam into engagement with the action. oi the spring end oi the post 'l7' and i be moved away thereby Will l length of the short did long diameter ofthe eccentric is 7 l and therefore the maximum -e plates -22' toward and n plates -2izwill he correspondwill be r s ill and accomplished t really one-half revolution of t thus permitting a very close so plates 22" after the ve been adjusted .to an upposition for any selected two or more local or dis 153 are using ,only slightly ocitics end itlis desired to the receiving station re improved condenser with 8 will first be roe bar 13- and plates into approximately inning; relation with the plates er "which the shaft -26 and its eccentric n'niy be operated to adjust direction or the other as may nzuned adjustment and provides in a single condenser the means fer selectively tuning Wide o, post x 'end plates 22 carried thereby in one difierent wave velocities, in addition to its regular function of tuning with stations having widely varying vvsve velocities.

Furthermore b spacing the plate supporting posts -1 and. -17' relatively istances apart and mounting them upon the opposite ends' of an insulating her as 4-- and also in using the insulating bar 12- reduces to a minimum the liability of electrical interference from external sources when the plates are tuned with some particular sending station.

It will be noted that one set of plates as QQ is adjustable rectilinearly relatively to The other set of plates as 22 and that the latter hasten independent adjustment through an arc of a circle about the axis of the pivot 24: toward and from the plates 2Q- for additionally varying the effective capacity of the condenser after the primary adjustment has been made.

The post -l7- cooperates with the loop -13 to limit the movement of the bar 12+ and plates 22- carried thereby in one direction, said bur being provided with a stop pin -12 cooperating with the post l7 to limit the movementof the bar 12 in the opposite direction.

lVhut I claim is:

1. A variable condenser comprising opposed sets of plates having their adjacent edges tapered toward their longitudinal cente 's, one set being adjustable rectilineerly, and means for adjusting the other set in an arc of a circle across the path of the first- IlilHlQCl set, v

2. A. variable condenser comprising opposed sets of plates, means including :1 slide for adjusting one set through a relatively. I long range, and separate means for sdjusting; the other set about an axis through a relatively shorter range.

8. A variable condenser comprising opposed sets of plates, means including a sliding bar for supporting one set of plates, and means including a pivoted ,post for supporting the other set of plates rotatably about the axis of the pivot. I

4. A variable condenser comprising opposed sets of plates, means including a slid-- ing bar for supporting one set of plates means including 21 rack and pinion for rcciprocuting the sliding bar and means for moving the other set of plates transversely of the movement of the bar.

A variable condenser comprisingopposed sets of plates. means including asliding bar for supporting one set of plates, :2 guide for said her, and resilient shims on the guide engaging the bar for yieldingly and frictional-1y holding the latter against lost motion in the guide.

Wit

' ed with pereilei ii'ensvei'se siois, condenser pistes seated in said slots, pin passing hhrough the loops anci ghreugh registering apertures :11 iahe pisses,- and'an insulating);

hioek secured. to and between the opposite arms or? said plate support.

8. A variable condenser comprising opposed sets of pistes, means including a rack snci pinion for hdjust-ing one set of plates rectihnearly reiativeiy ie the other set, and means inciuding o cam for adjusting the other set of plates relatively to the firstmmeti set.

9, A variable coiidensez' of the characiei' Lie-scribed comprising opposed sets of plates bar for movi no means including a sliding one set of plates rectihneerly relatively to 7 she other see, and means including a pivoiedi ter described; s. set of means including an eccentric eiegegmg she 1 i eeeese posh7 for moving the other; set of plates rels- 39 tiv eiy to the first-named set. i

10; A variable condenser oi the character: described comprising opposed sets of plates, neai'is including a sliding bill" {or suppori--, mg 0126 set ofplstes means including :1 rack 35 on for reciprccaahng sa d he; swans inciuding a pivoieei post for supporiing the other set of plates smi mes ifecluoiing a rotary (em fioi' adjusting izhe pivoted post about The axis of its pivot.

11. In 2! variable eomienseroi the chm-sec. tci' described, a set of condenser: plates, suppoi'tieg means for saiei pistes including a slide {or moving the plates endwi'se, a guide for the slide, resilient means on the guidie forengaging the slide and. frietioneily holding it in its adjusted position, and a reek and a pinion for reciprocating the sliflen 12. In e variable conciense'r of. the characceodenser plates is supporting block for said. pistes, e support ing post for the block pivoted in swing in the direction of iength of the Modes, and

and pim post for rocking the pest upon its meet.

in witness whereof I have hereunto see my hand this 12th day of August, 1925:,

WWLLIAM L, HUDSUN. 

